Toshiba TV29C90 problem; Image fades to black...

Umm, we used to bump the heater and then let the thing run for about a week.. I have seen them get better and better with a moderate boost and then last a very long time.

We never rejuved a camera tube but someone told me and I found out that is you keep one of those old cameras running for days and days looking straight at a white surface it rejuved them somewhat. There was really no way to boost the filament, there was no room for anything.

 

On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber wrote:

I have a ford ranger and the cassette player has a lot of static the radio
plays fine.I have demagnetizer and cleaning tapes I was thinking of using
acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm rollers and other plastic / rubber parts . Alcohol will dry out the oils in plastics and rubber , causing them to harden . Acetone will tend to dissolve these materials .

 

[Terry Schwartz]

On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6, wri...@gmail.com wrote:

On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber wrote:
I have a ford ranger and the cassette player has a lot of static the radio
plays fine.I have demagnetizer and cleaning tapes I was thinking of using
acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm rollers and other plastic / rubber parts . Alcohol will dry out the oils in plastics and rubber , causing them to harden . Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was initiated.... So yeah, I bet they're dried out.

 

[Look165]

Just clean with a Q-tip and that's all.
Cleaning tape is usefull.

writemj@gmail.com a Êcrit le 09/01/2019 à 17:07 :

On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber wrote:
I have a ford ranger and the cassette player has a lot of static the radio
plays fine.I have demagnetizer and cleaning tapes I was thinking of using
acetone on the heads?
Use a cleaning tape or the like . Chemicals and liquids can harm rollers and other plastic / rubber parts . Alcohol will dry out the oils in plastics and rubber , causing them to harden . Acetone will tend to dissolve these materials .

 

On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:

On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6, wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber wrote:

I have a ford ranger and the cassette player has a lot of static the radio
plays fine.I have demagnetizer and cleaning tapes I was thinking of using
acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm rollers and other plastic / rubber parts . Alcohol will dry out the oils in plastics and rubber , causing them to harden . Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was initiated.... So yeah, I bet they're dried out.

cleaning tapes are almost hopeless anyway. Wet cleaning is the only effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the pinch wheels as well. All must be bone dry before putting a tape in.


NT

 

[The Real Bev]

On 01/09/2019 11:03 AM, tabbypurr@gmail.com wrote:

On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:
On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6,
wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber
wrote:

I have a ford ranger and the cassette player has a lot of
static the radio plays fine.I have demagnetizer and cleaning
tapes I was thinking of using acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm
rollers and other plastic / rubber parts . Alcohol will dry out
the oils in plastics and rubber , causing them to harden .
Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was
initiated.... So yeah, I bet they're dried out.

cleaning tapes are almost hopeless anyway. Wet cleaning is the only
effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.

The heads are metal. No worries about hardening. Who told you there
was oil in rubbing alcohol? It's alcohol and water. Period.


--
Cheers, Bev
"I've learned that you can keep puking long
after you think you're finished." -- SL

 

[gregz]

The Real Bev <bashley101@gmail.com> wrote:

On 01/09/2019 11:03 AM, tabbypurr@gmail.com wrote:
On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:
On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6,
wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber
wrote:

I have a ford ranger and the cassette player has a lot of
static the radio plays fine.I have demagnetizer and cleaning
tapes I was thinking of using acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm
rollers and other plastic / rubber parts . Alcohol will dry out
the oils in plastics and rubber , causing them to harden .
Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was
initiated.... So yeah, I bet they're dried out.

cleaning tapes are almost hopeless anyway. Wet cleaning is the only
effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.

The heads are metal. No worries about hardening. Who told you there was
oil in rubbing alcohol? It's alcohol and water. Period.

Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.

Greg

 

On Thursday, 10 January 2019 04:12:57 UTC, The Real Bev wrote:

On 01/09/2019 11:03 AM, tabbypurr wrote:
On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:
On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6,
wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber
wrote:

I have a ford ranger and the cassette player has a lot of
static the radio plays fine.I have demagnetizer and cleaning
tapes I was thinking of using acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm
rollers and other plastic / rubber parts . Alcohol will dry out
the oils in plastics and rubber , causing them to harden .
Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was
initiated.... So yeah, I bet they're dried out.

cleaning tapes are almost hopeless anyway. Wet cleaning is the only
effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.

The heads are metal. No worries about hardening. Who told you there
was oil in rubbing alcohol? It's alcohol and water. Period.

I forget the official standard for it, but it contains rather more than water & alcohol. Looked it up last year.


NT

 

[Look165]

The body of the head is made of molded resin.
The magnetic element is made of polished folded iron.(try to look with a
microscope).
I go on saying that a good quality cleaning head is useful.
Don't forget to adjust the azimuth setting at the end.


gregz a Êcrit le 10/01/2019 à 09:07 :

The Real Bev <bashley101@gmail.com> wrote:
On 01/09/2019 11:03 AM, tabbypurr@gmail.com wrote:
On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:
On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6,
wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber
wrote:
I have a ford ranger and the cassette player has a lot of
static the radio plays fine.I have demagnetizer and cleaning
tapes I was thinking of using acetone on the heads?
Use a cleaning tape or the like . Chemicals and liquids can harm
rollers and other plastic / rubber parts . Alcohol will dry out
the oils in plastics and rubber , causing them to harden .
Acetone will tend to dissolve these materials .
All those materials are 19 years older than when this topic was
initiated.... So yeah, I bet they're dried out.
cleaning tapes are almost hopeless anyway. Wet cleaning is the only
effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.
The heads are metal. No worries about hardening. Who told you there was
oil in rubbing alcohol? It's alcohol and water. Period.

Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.

Greg

 

And I suppose you have to pause your 25/hr 8-day-a-week smoking habit during this time too, right?

 

[Pat]

On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber wrote:

I have a ford ranger and the cassette player has a lot of static the radio
plays fine.I have demagnetizer and cleaning tapes I was thinking of using
acetone on the heads?

As other have pointed out, the OP made his request almost 19 years
ago, but since everyone here seems to be discussing the merits of
various head cleaning methods, I have a question. How can "static" be
a symptom of dirty tape heads? Drop outs - yes. Loss of highs - yes.
Static? Sounds more like a bad connection or static electricity being
generated somewhere.

 

[Ralph Mowery]

In article <312172279568800599.965334zekor-comcast.net@news.eternal-
september.org>, zekor@comcast.net says...

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.

The heads are metal. No worries about hardening. Who told you there was
oil in rubbing alcohol? It's alcohol and water. Period.


Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.

Rubbing alcohol seems to be a gernetic term by many.

One form is about 70% alcohol and some oils and water.

You can buy some that is about 90% alcohol and 10 % water with no other
oils in it. I have some here labled 91 % and some labled 99%. They are
isoprople alcohol and not labled rubbing alcohol. Alcohol absorbs water
from the atmosphere so before long the 99% will be much less if open to
the air.

Xylene was used at one time to clean the tape machinery. I am not sure
if it is in the stores any more or not.

 

[Phil Hobbs]

On 1/10/19 10:37 AM, Ralph Mowery wrote:

In article <312172279568800599.965334zekor-comcast.net@news.eternal-
september.org>, zekor@comcast.net says...

Don't use rubbing alcohol, it contains oil. Vodka is fine.
Clean the pinch wheels as well. All must be bone dry before
putting a tape in.

The heads are metal. No worries about hardening. Who told you
there was oil in rubbing alcohol? It's alcohol and water.
Period.


Heads have some insulating material imbedded. Real rubbing alcohol
is supposed to have oil to prevent skin drying too much. Most
don't. Isopropyl or ethyl cleans heads.



Rubbing alcohol seems to be a gernetic term by many.

One form is about 70% alcohol and some oils and water.

You can buy some that is about 90% alcohol and 10 % water with no
other oils in it. I have some here labled 91 % and some labled 99%.
They are isoprople alcohol and not labled rubbing alcohol. Alcohol
absorbs water from the atmosphere so before long the 99% will be much
less if open to the air.

Xylene was used at one time to clean the tape machinery. I am not
sure if it is in the stores any more or not.

Some rubbing alcohol is 80% isopropyl and 20% water. That has very
different properties, and will craze acrylics instantaneously. It also
leaves residues that cause enormous amounts of 1/f noise in front end
circuits.

Everclear is much better controlled.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[Fox's Mercantile]

On 1/10/19 9:37 AM, Ralph Mowery wrote:

Rubbing alcohol seems to be a gernetic term by many.

One form is about 70% alcohol and some oils and water.

Or you can just buy Denatured alcohol.

Xylene was used at one time to clean the tape machinery. I am not sure
if it is in the stores any more or not.

It is available in the paint section.


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[pfjw@aol.com]

Some "Stuff":

Acetone (C3H6O) will attack spolyester resin, many two-part epoxies, ABS plastics, polystyrene, some forms of nylon, lacquer, shellac, unstabilzed celluloid and superglue.

Denatured Alcohol (C2H5OH)is ETHANOL with some other ingredient added to render it unfit for consumption. Typically that "other" is wood alcohol/methanol.

"Rubbing Alcohol" (C3H7OH) is, typically some mixture to include isopropyl alcohol, water and any number of other ingredients, including scents and lubricants.

"Wood Alcohol/Methanol/Stove Fuel" CH3OH) will attack a range of plastics.

https://www.plasticsintl.com/chemical-resistance-chart

A few actual facts do help speed the discussion along. Not to be snarky even a little bit, as I was somewhat surprised by the sensitivities of some things on the list.

Peter Wieck
Melrose Park, PA

 

[Dave Platt]

In article <5f4955a0-fad8-4e2a-b6d7-8ab62e8f6f54@googlegroups.com>,
<tabbypurr@gmail.com> wrote:

On Thursday, 10 January 2019 04:12:57 UTC, The Real Bev wrote:

The heads are metal. No worries about hardening. Who told you there
was oil in rubbing alcohol? It's alcohol and water. Period.

I forget the official standard for it, but it contains rather more than water & alcohol. Looked it up last year.

"Rubbing alcohol" is addressed by several different USP standards.

"Isopropyl Rubbing Alcohol USP" is defined as 70% isopropyl alcohol
(plus or minus a couple of percent) by volume, the remainder
"water, with or without suitable stabilizers, perfume oils, and color
additives certified by the FDA for use in drugs." So, even drugstore
isopropyl alcohol can have components other than alcohol and water.

"Rubbing Alcohol USP" (without the word "isopropyl") is ethanol,
water, denaturants (e.g. sucrose octaacetate or denatonium benzoate),
"with or without color additives, and perfume oils."

Some commercial rubbing alcohol used to contain lanolin, to help keep
the skin from drying out; I don't know if any still does.

If you don't see the term "USP" on the label, then whatever you're
buying may not comply with the USP standards I mentioned.

Outside the US things are even more complex; British "surgical
spirit" is methylated spirit (ethanol denatured with methanol),
castor oil, diethyl phthalate, and methyl salicylate ("wintergreen
oil").

(Relevant information cribbed from the Wikipedia article on rubbing
alcohol, and the newdruginfo.com links which cite the USP
definitions).

For electronics cleaning purposes such as tape-deck heads, I prefer to
buy technical-grade isopropyl alcohol. My local Frys carries the
Puretronics brand ($9/quart).

 

[pfjw@aol.com]

Adding to Dave's post - a bit of history:


"In 1906, President Theodore Roosevelt signed the Pure Food and Drug Act into law. The law elevated the public health role of the United States Pharmacopeia because it defined a drug as “all medicines and preparations recognized in the United States Pharmacopeia (USP) or National Formulary (NF),” and defined adulterated drugs as those referenced in the USP and NF but differing from “the standard of strength, quality, or purity” specified in the two compendia. The practice of labeling medicines with the letters “U.S.P.” or “USP” became more prevalent. In 1938, the Food, Drug and Cosmetic Act reaffirmed the role of the pharmacopeia and expanded its role to include USP standards for labeling and packaging. "

Peter Wieck
Melrose Park, PA

 

On Thu, 10 Jan 2019 08:07:13 -0000 (UTC), gregz <zekor@comcast.net>
wrote:

The Real Bev <bashley101@gmail.com> wrote:
On 01/09/2019 11:03 AM, tabbypurr@gmail.com wrote:
On Wednesday, 9 January 2019 16:12:46 UTC, Terry Schwartz wrote:
On Wednesday, January 9, 2019 at 10:07:57 AM UTC-6,
wri...@gmail.com wrote:
On Wednesday, August 2, 2000 at 3:00:00 AM UTC-4, GHilgenber
wrote:

I have a ford ranger and the cassette player has a lot of
static the radio plays fine.I have demagnetizer and cleaning
tapes I was thinking of using acetone on the heads?

Use a cleaning tape or the like . Chemicals and liquids can harm
rollers and other plastic / rubber parts . Alcohol will dry out
the oils in plastics and rubber , causing them to harden .
Acetone will tend to dissolve these materials .

All those materials are 19 years older than when this topic was
initiated.... So yeah, I bet they're dried out.

cleaning tapes are almost hopeless anyway. Wet cleaning is the only
effective option.

Don't use rubbing alcohol, it contains oil. Vodka is fine. Clean the
pinch wheels as well. All must be bone dry before putting a tape in.

The heads are metal. No worries about hardening. Who told you there was
oil in rubbing alcohol? It's alcohol and water. Period.


Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.

Greg

I have used isopropyl alcohol all my long life for audio and video
heads. Works well.....

Acetone is very harsh and will melt plastic and remove paint. I will not
use it for this....

 

On Thursday, 10 January 2019 20:08:06 UTC, Dave Platt wrote:

In article <5f4955a0-fad8-4e2a-b6d7-8ab62e8f6f54@googlegroups.com>,
tabbypurr> wrote:
On Thursday, 10 January 2019 04:12:57 UTC, The Real Bev wrote:

The heads are metal. No worries about hardening. Who told you there
was oil in rubbing alcohol? It's alcohol and water. Period.

I forget the official standard for it, but it contains rather more than water & alcohol. Looked it up last year.

"Rubbing alcohol" is addressed by several different USP standards.

"Isopropyl Rubbing Alcohol USP" is defined as 70% isopropyl alcohol
(plus or minus a couple of percent) by volume, the remainder
"water, with or without suitable stabilizers, perfume oils, and color
additives certified by the FDA for use in drugs." So, even drugstore
isopropyl alcohol can have components other than alcohol and water.

"Rubbing Alcohol USP" (without the word "isopropyl") is ethanol,
water, denaturants (e.g. sucrose octaacetate or denatonium benzoate),
"with or without color additives, and perfume oils."

Some commercial rubbing alcohol used to contain lanolin, to help keep
the skin from drying out; I don't know if any still does.

If you don't see the term "USP" on the label, then whatever you're
buying may not comply with the USP standards I mentioned.

Outside the US things are even more complex; British "surgical
spirit" is methylated spirit (ethanol denatured with methanol),
castor oil, diethyl phthalate, and methyl salicylate ("wintergreen
oil").

(Relevant information cribbed from the Wikipedia article on rubbing
alcohol, and the newdruginfo.com links which cite the USP
definitions).

For electronics cleaning purposes such as tape-deck heads, I prefer to
buy technical-grade isopropyl alcohol. My local Frys carries the
Puretronics brand ($9/quart).

We generally use BP & BSes rather than USP. So the answer depends to some extent on where the enquirer is.


NT

 

[Jeff Liebermann]

On Thu, 10 Jan 2019 08:07:13 -0000 (UTC), gregz <zekor@comcast.net>
wrote:

Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.
Greg

Perhaps it would be interesting to see what's in a commercial tape
head cleaner?

GC Electronics Magnetic Head Cleaner
Kinda looks like alcohol (ethanol) is safe.
<http://www.gcelectronics.com/order/msds/116.pdf>
Ethanol 86.8%
Methanol 4.5%
Acetic Acid Ethyl Ester 1.1%
2-Pentanone, 4-Methyl- 1.0%
Solvent Naphtha 0.4%
(Petroleum), Light Aliph.
Hexane 0.4%
2-Propanol,2-Methyl- 0.11%
Benzene, Methy- 0.05%
Cyclohexane 0.001%
Other 5.7%

MG Chemicals 407c Audio/video head cleaner
<https://www.mgchemicals.com/products/cleaning-products-for-electronics/cleaners/specialty-cleaners/audiovideo-head-cleaner-407c>
It says "Safe on Plastics".
The composition is somewhat different from the GC head cleaner.
<https://www.mgchemicals.com/downloads/msds/01%20English%20Can-USA%20SDS/sds-407c-l.pdf>
67-63-0 propan-2-ol (IPA) 50%
107-83-5 methyl-2-pentane 15-25%
96-14-0 methyl-3-pentane 5-10%
79-29-8 dimethyl-2,3-butane 5-10%
75-83-2 dimethyl-2,2-butane 3-7%
110-54-3 n-hexane 1-2%

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558